本题目来源于试卷: Unity and Diversity A.1 Water，类别为 IB生物学
[单选题]
Which of the following statement(s) about the roj 1q810c jtbu2mvisaye5/o,o iw0p+u le of water as a solvsqq qt;t2q) b 12wcu3m,nznb+ent is correc2; ut,nmcq 3qnbbz)s2 w +qtq1t?
I. Salt can dissolve in water because it is hydrophilic
II. Lipids cannot dissolve in water because they are non-polar
III. Cellulose can dissolve in water, as it is able to form hydrogen bonds
A. I only
B. I and III only
C. I and II only
D. I, II and III
参考答案: C
本题详细解析:
Salt, an ionic compound, dissolves readily in water becaop t7mxf m;/qb8r,us:yp9al 3use water is a polar solvent and can interact with the charged ions in salt through electrostatic attractions. Substances that have an affinity for water and can form interactions with water molecules are referred to as hydrophilic (Statement poxp ysq m:3u /9f,a;t7bmrl 8I). Lipids are non-polar molecules, and water is a polar solvent. Polar and non-polar substances do not readily mix because water molecules are attracted to each other through hydrogen bonding and other dipole-dipole interactions. Lipids are hydrophobic, meaning they repel water and do not dissolve well in it (Statement II). Choice C is, therefore, correct.
Although cellulose can form hydrogen bonds, it is insoluble (Statement III) as it is too large to dissolve in water; Choices B and D are therefore incorrect as they include this statement. Choice A is incorrect as it does not include statement II.
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